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Friction stir welding keyhole filling method

A technology of friction stir welding and keyhole, which is applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of limited weld structure, high equipment requirements, and low mechanical properties of the repaired position, and meet the equipment requirements Low, no metallurgical defects, the effect of eliminating keyholes

Inactive Publication Date: 2016-12-21
SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The problem solved by the invention is that when filling the keyhole of the existing friction stir welding seam, the requirements for the retraction friction stir welding equipment are high, the structure of the weld seam is limited, and the welding repair is prone to defects and the mechanical properties of the repaired position are low

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Embodiment Construction

[0015] The present invention will be further elaborated below in conjunction with the accompanying drawings and embodiments.

[0016] The friction stir welding keyhole filling method provided by the preferred embodiment of the present invention includes the following steps:

[0017] Step 1. Make and install the filling plug 2. The filling plug 2 is made of the same grade material as the base metal to be repaired or a material of a different grade but with a higher strength grade. The shape is frustum-shaped, and the cone angle α should not be greater than 30°; 1 on.

[0018] Step 2: Start the welding machine, and press the plug 2 into the welding keyhole 3 . During the pressing down process of the plug head 2, the pressing speed should be 0.25%~0.5% of the rotation speed of the stirring tool;

[0019] Step 3, stirring in situ. Stir in situ according to a certain parameter, and the stirring parameter should be appropriately higher than the original friction stir welding par...

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Abstract

The invention discloses a friction stir welding keyhole filling method. The friction stir welding keyhole filling method is characterized by including the steps that firstly, a filling plug head is manufactured and installed; secondly, a welding machine is started, and the plug head is pressed in the position of a keyhole; thirdly, in-situ stirring is conducted according to a certain parameter; and fourthly, a main shaft is lifted up, and filling is completed. According to the method, the friction stir welding keyhole is filled in an aluminum alloy in-situ stirring manner, the welding keyhole can be completely illuminated, and the mechanical performance of the filling position is not obviously reduced. Compared with an existing friction stir welding keyhole defect repair method, pump-back shafts are not needed for devices, and requirements for the devices are low; the keyhole can be completely eliminated, and no metallurgical defects are generated; and the mechanical performance of the keyhole filling part is as high as that of other positions of weld joints.

Description

technical field [0001] The invention relates to the field of friction stir welding, in particular to a method for filling a keyhole in friction stir welding. Background technique [0002] After more than 20 years of development, the friction stir welding technology has become increasingly mature, and the technology has included many technologies such as retraction friction stir welding, static shoulder friction stir welding, double rotation friction stir welding, and double shoulder friction stir welding. Welding materials are also expanded from non-ferrous metals such as aluminum alloys, copper alloys, and titanium alloys to ferrous metals such as steel and metal matrix composites. However, the development of the above-mentioned technologies and the expansion of the scope of applicable materials have failed to solve various defects in the friction stir welding process, such as welding keyholes, tunnel defects, and incomplete penetration defects. [0003] When a defect occu...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K20/24
CPCB23K20/122B23K20/24
Inventor 宋学成崔凡徐文豪徐奎封小松高嘉爽郭立杰
Owner SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
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